EP 1780617 A1 20070502 - Controller and method of controlling an apparatus and system including such a controller
Title (en)
Controller and method of controlling an apparatus and system including such a controller
Title (de)
Regler und Verfahren zum Regeln einer Vorrichtung und System beinhaltend einen solchen Regler
Title (fr)
Unité de commande et procédé de commande d'un appareil et systéme comprenant un tel unité de commande
Publication
Application
Priority
- EP 02732912 A 20020605
- GB 0113627 A 20010605
Abstract (en)
A delay-locked loop (DLL) circuit has a reference signal input for a receiving a periodic reference signal and a number of signal outputs for outputting respective output signals derived from the reference signal and having a desired phase relationship with one another. The DLL circuit comprises a voltage controlled delay line (VCDL) comprising a plurality of identical delay stages connected in series, and a feedback loop including a phase comparator for controlling the VCDL such that the total delay over a number of stages matches the period of the periodic reference signal. Signal outputs are connected to derive their respective output signals from respective nodes within said delay line. The phase comparator compares the phase of first and second differently delayed versions of the reference signal from respective nodes within the variable delay line separated only by a plurality of identical delay stages. Duty cycle distortion is minimised as a result. Start-up control circuitry is arranged (i) to minimise the delay of the variable delay line prior to starting operation and (ii) to cause said phase comparator to ignore a first transition in one signal, in determining the relative order of transitions in the compared signals. False locking and harmonic locking are thus eliminated while permitting a very wide range of input frequencies.
IPC 8 full level
G05B 13/02 (2006.01)
CPC (source: EP US)
G05B 13/0265 (2013.01 - EP US)
Citation (applicant)
- EP 0334698 A2 19890927 - MEASUREX CORP [US]
- DE 4340746 A1 19940601 - TOYOTA CHUO KENKYUSHO AICHI KK [JP]
- WO 0135175 A1 20010517 - ADAPTIVE CONTROL LTD [GB], et al
- STEPHEN J ELLIOTT: "Optimal controllers and Adaptive Controllers for Multichannel Feedforward Control of Stochastic Disturbances", IEEE TRANSACTIONS ON SIGNAL PROCESSING, vol. 48, no. 4, April 2000 (2000-04-01), XP011058915
Citation (search report)
- [XY] EP 0334698 A2 19890927 - MEASUREX CORP [US]
- [X] DE 4340746 A1 19940601 - TOYOTA CHUO KENKYUSHO AICHI KK [JP]
- [A] WO 0135175 A1 20010517 - ADAPTIVE CONTROL LTD [GB], et al
- [Y] STEPHEN J ELLIOTT: "Optimal Controllers and Adaptive Controllers for Multichannel Feedforward Control of Stochastic Disturbances", IEEE TRANSACTIONS ON SIGNAL PROCESSING, IEEE SERVICE CENTER, NEW YORK, NY, US, vol. 48, no. 4, April 2000 (2000-04-01), XP011058915, ISSN: 1053-587X
Designated contracting state (EPC)
DE FR GB
DOCDB simple family (publication)
WO 02099544 A1 20021212; DE 60217487 D1 20070222; DE 60217487 T2 20071018; DE 60236035 D1 20100527; EP 1397727 A1 20040317; EP 1397727 B1 20070110; EP 1780617 A1 20070502; EP 1780617 B1 20100414; EP 1780618 A1 20070502; GB 0113627 D0 20010725; US 2005027373 A1 20050203; US 2008091282 A1 20080417; US 2009299499 A1 20091203; US 7107108 B2 20060912; US 7558634 B2 20090707; US 8032237 B2 20111004
DOCDB simple family (application)
GB 0202571 W 20020605; DE 60217487 T 20020605; DE 60236035 T 20020605; EP 02732912 A 20020605; EP 07100308 A 20020605; EP 07100309 A 20020605; GB 0113627 A 20010605; US 47317809 A 20090527; US 47974104 A 20040915; US 51368106 A 20060830